If one angle is half of its complementary angle, find that angle.

In a polygon, the sum of the interior angles is double the sum of the exterior angles. What is the number of sides of the polygon?

ABCD is a rhombus whose one angle is 60°.Find the ratio of the lengths of its diagonal?

Each side of an equilateral triangle is 4 cm. What will be its area?

O is the orthocentre of ΔABC. If ∠BOC=110°, ∠BAC is equal to

If the ratio of the measurement of the four angles of a quadrilateral is 1: 2: 3: 4, then the measurement of its smallest angle is-

If the area of a circle, inscribed in a equilateral triangle is 4 π cm², then what is the area of the triangle?

The largest and the second largest angles of a triangle are in the ratio of 3 : 2 respectively. The smallest angle is 20% of the sum of the rest two angles. What is the sum of the smallest and the second largest angles?